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Product Description (Detailed):

Elevate your light sensing capabilities with our robust LDR Sensor 12mm – a larger Light Dependent Resistor (Photoresistor). This highly sensitive component is an essential tool for advanced hobbyists, industrial designers, and educators seeking more pronounced and accurate light detection in their electronic projects. With its substantial 12mm diameter, it offers a larger active sensing area compared to smaller LDRs, resulting in enhanced sensitivity to ambient light conditions.

The LDR (Light Dependent Resistor), also known as a photoresistor or photocell, operates on the fundamental principle of photoconductivity: its electrical resistance directly varies with the intensity of light illuminating its surface. In low light or complete darkness, this 12mm photoresistor exhibits a significantly high resistance (often in the megaohm range), acting much like an open circuit. Conversely, as light intensity increases, its resistance rapidly decreases (down to a few hundred ohms in bright light), allowing more current to flow through. This wide dynamic range of resistance makes it effortlessly compatible with microcontrollers like Arduino, Raspberry Pi, and various other platforms, typically integrated into a simple voltage divider circuit for analog input readings.

Commonly constructed from cadmium sulfide (CdS), this 12mm LDR sensor is highly responsive to the visible light spectrum, making its behavior closely mimic how the human eye perceives light. Its increased sensitivity makes it particularly well-suited for applications such as automatic outdoor lighting controls, high-precision light alarms, advanced robotics for environment sensing, solar tracking systems, and industrial light intensity monitoring. Simple to integrate, cost-effective, and highly reliable, our 12mm LDR sensor is the ideal choice for projects demanding accurate light measurement or robust light-triggered automation. Incorporate this fundamental component to bring intelligent light responsiveness to your electronic designs.

The 12mm LDR (Light Dependent Resistor) is a highly sensitive passive light sensor that reduces its resistance in response to increased light levels. This makes it ideal for detecting ambient light and triggering electronic responses, such as turning on/off lights or adjusting brightness in smart systems.

With a large 12mm sensing diameter, it offers better light absorption and faster response compared to smaller LDRs. It's widely used in automatic night lamps, solar lighting, garden automation, Arduino light meters, and IoT-based daylight sensing systems.

Simple to use in both analog and digital circuits, the LDR outputs variable resistance which can be read using Arduino's analog pins to implement light-based control.

Key Features:

• 12mm diameter high-sensitivity LDR/photoresistor

• Resistance decreases with increasing light intensity

• Two-terminal, through-hole component

• Ideal for Arduino, Raspberry Pi, solar trackers, and light-based automation

• Large sensing area ensures fast response and better accuracy

• Works with analog and digital circuits

Technical Specifications:

How to Use:

1. Connect one pin of the LDR to Vcc (5V).

2. Connect the other pin to a voltage divider resistor (e.g., 10KΩ) and then to GND.

3. The junction between LDR and resistor connects to an analog pin (e.g., A0 on Arduino).

4. Use analogRead() to monitor light intensity and trigger outputs accordingly.

Common setup: LDR + 10KΩ resistor voltage divider → Arduino analog input.

Applications:

• Automatic street lighting systems

• Light-sensing circuits for Arduino/IoT

• Solar garden lamp automation

• Brightness control for LCD displays

• Smart lighting and energy-saving devices

• Security systems (day/night detection)

Package Includes:

• 1× 12mm LDR (Light Dependent Resistor)